Most PHP Interview Questions asked by company

PHP (Hypertext Preprocessor) is a widely used server-side scripting language for web development. During PHP interviews, candidates may be asked a variety of questions to assess their knowledge and skills. Here's a list of common PHP interview questions that are often asked by companies

1. What is PHP, and what does the acronym stand for?

• PHP is a server-side scripting language commonly used for web development. It originally stood for "Personal Home Page" but now stands for "Hypertext Preprocessor."

2. How does PHP differ from client-side languages like JavaScript?

• PHP is a server-side language, meaning it runs on the server and processes the code before sending the result to the client. JavaScript, on the other hand, is a client-side language that runs in the user's browser.

3. What are the differences between GET and POST methods in PHP?

• GET sends data through the URL, and data is visible in the URL. POST sends data through HTTP headers, and data is not visible in the URL.

4. Explain the difference between include and require in PHP.

• Both include and require are used to include files, but require will produce a fatal error if the file is not found, while include will only produce a warning.

5. What is the purpose of the 'echo' and 'print' statements in PHP?

• Both are used to output data to the screen. The main difference is that echo can take multiple parameters, while print can only take one, and print always returns 1.

6. What is the difference between '== and '===' operators in PHP?

• '==' checks for equality, while '===' checks for both equality and type, making it a stricter comparison.

7. Explain what a session is in PHP.

• A session is a way to store information (in variables) to be used across multiple pages.

8. What is the purpose of the 'mysqli' and 'PDO' in PHP?

• Both are used to connect to databases. 'mysqli' is specific to MySQL databases, while 'PDO' is a database access layer providing a uniform method of access to multiple databases.

9. How does error handling work in PHP?

• PHP has several error-handling functions and settings, including error_reporting, ini_set, and try-catch blocks for exceptions.

10. Can you explain the difference between cookies and sessions in PHP? - Cookies store information on the client side, while sessions store information on the server side. Sessions are more secure for sensitive data.